Brother’s wife is a schizophrenic

Hey guys, just need some advice on how to approach this situation, I would like to know if anyone here has been diagnosed with schizophrenia and in a healthy relationship or know of anyone that is? My brother has married a schizophrenic in 2022 and over the last 2 years, all his time and effort is put into supporting her. He has lost friends, she doesn’t really allow him to go out as she says she sees into the spirit and thinks he will cheat. He has no motivation to reach his own goals, she doesn’t work so he’s financially burdened, she drinks so I don’t even know if the medication is being as effective as it could be. They are both Christian but quit every church because she starts thinking the churches are out to get her. If this mental health illness wasn’t a factor then this would clearly be a toxic relationship so I’m wondering if this is normal and whether it will ever get better for him?